High Quality Material: The centrifugal clutch is made of high-quality iron, strong, wear-proof, fast heat disation, and large torsion force. Easy Installation: The karting clutch kit includes two fixing screws and a chain, which is easy to install. It can be changed quickly and is a perfect substitute for mini bikes and karts. Applicable to 6.5 Engine: 3/4 inch bore, 12 teeth and #35 chain are designed for 6.5 engine. The centrifugal clutch is suitable for the 6.5 engine of the kart micro bike. Widely Used: 100% brand new high-quality after-sales centrifugal clutch chain screw set. Very suitable for karts, scooters and fun karts. Customer Service: Not only the premium product, we also provide a perfect after-sale service. If you have any problem, please feel free to contact with us, we will try our best to solve it.